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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '125e5ad2dd9352cb71b7c0d492ff6633ce72bea2362923d92a056671933dbe04' 
  AND token = 'TrKYDUPokwbuLF9nc6lGSpm+TB1kgkb3a0QgrXPBBoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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