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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eaaeef5ba1ecc2a97d9a64a83ee624bfc1c0ba720cc085edd9bd89b8df39b45c' 
  AND token = 'TPKGXcT70vH5L7viv1Gf42FRRO6WH0ERxumUD+Ssd64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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