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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '308ee43ec4828645d56fea6af1bec2fd4586df69a036faad5add8c3aab1841dc' 
  AND token = 'V+0E8IrFdbXTdDvU/SccUt7tioVlhSertHRARaXfR80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}