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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0c2d94e8425b6f8880970a315ebfbb7e7fe9e0a4a6f4bf54908122fe7b577b48' 
  AND token = 'HIUiwunFt+EnFJWs1tbwY+JPXr+hwNQbDok6ZNTsO40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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