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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd748c87e4b8a5f5c7d1fa855a5b22dde2b659d65dc65f2358bc16d1126e8a71a' 
  AND token = 'dRE3cJ8cb3VQ/9dKEyueO4QShre0B6gAj4usLgK1jww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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