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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7ca8051436bd0621482c976e4c78f625d6b7a45fc66f8a60a0b64aa0cbb8ed59' 
  AND token = 'cB5RJtbxSDds1KaySScKPhGWJ8wrTTOKTKLgVQGPpQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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