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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '10e204c53a15f1a6c34c018d613092460bc4d6a7aee50da2fae0b762bac195a2' 
  AND token = 'l/iQ1r/L++0J43RR97I7674U138yMwEHQhIv99ZIOUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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