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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f4e1fb8a7716c092adbc02e33daa11c16408a65e9882f16f272924282665fce3' 
  AND token = 'zecatMp9OCo2+AYSCZxtXQKpBDBvA6ZPvx6jA33YRVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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