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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a99e1607afe9b68fd6797a0d7d19355a3e2576639b3a716b5fdc1d23f54b6c41' 
  AND token = 'tng4XIR92NQKfBRgE4aJf7AvvNINpkb1iHYmGbjalns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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