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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5c5acae4c4f8498531ef249d16eaa62e825f11664a11b152afd358489a2e21f6' 
  AND token = 'GwppGKoALHhH8Jaa1HjNCLNHfAHfyBDJ8Lf7GrqYN3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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