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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bc8a48ad2a907a4deb9d2d4fe285a6ac92f347e40faf659b0e2d4f2bbeaa5000' 
  AND token = 'imKIfGODzA9uWptsLC0WJ1Qef8G+dO0UVSGH5ZAHHvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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