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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '98ba478d7dc4ada9abbdf43c62b0d6b18e3536310eb7ced1cacd5b0a84a2bf9d' 
  AND token = '4BkyIyOzzZIKTFmFVVOuSqRi7VaXL+66oA0gOxcp54g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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