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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd7c144c4b3a99a6f064e8f796a8b84fb9c082b2c3dfe0a7f57d06d01f48b79d3' 
  AND token = 't2AHEIXrnAom9eZvk8RkwiuMKfQLEokahvyIPt4YaOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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