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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '80ca104a0428369dd613bc2d67afb4c48ebc217fc80ef17f17f791325b933de8' 
  AND token = 'uDHPYu1Z1Sx87p4R6xwcKydY7Aqe9PSQzzd9eij8mKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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