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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c91acce02d420ea9860b93dc2dbcef4463d666557f6ea4dda8dcc8929353eecf' 
  AND token = 'rD74hl2+AqY5++qB+KjP2Kef+bwAcwe4v7TO+GdhcRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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