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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '731cf09c582c22a1c9ee9a9ab939ba401467a39ad9f67477306dc3d997d803c2' 
  AND token = '/AgF60SWliTRvZGfqfDJmSt8kwAIpAPt+Lg9bVxTqEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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