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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '53c5ad694d02fc5463f5514877015f1928e50e3230d2ff15ec009d35a1f197b6' 
  AND token = 'AmnIoeFh2yIleO7LCTUKeKrvAf21ll+hdJ9OGkKZHtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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