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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '85f723e2130f6e06d031556ebb97dac72274acad4287e58405c197c48f2a8df1' 
  AND token = 'yJ1Wd0nI2eGAAWgM+FN2MOybb+qe1qGVj1Bdmhb5a4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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