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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '2542d4b973e3fc734217e815c21e980e488c96e47bc406675de2f7cf9cc61c11' 
  AND token = 'BklPe5Vlw4MwF84ljvIz+1Ju4eFIRRGlHpNalAzCKys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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