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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '2c08284d9f834dda01025c993f9e70ef94077b3d5d4d77f20347148470758e70' 
  AND token = 'HCrItv2EWTAJKgfOKQZM22fxfAQB8DJL4Z71+2RKSmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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