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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1610650730552139211546a74988192d26c8c8448e3766bd45690411115ee3c9' 
  AND token = 'FaZGBrj02pM2ijk4qlc6km8HVn4qD8Mh6asGi3vx8Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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