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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3d69637483b8e7c45bc004ddb979d58d8e396ca3a120f0c6186828a7de54e767' 
  AND token = 'ymNIBc6O4LY7gFNBQ7nAqidJqiRCnOHzikgR9iUofn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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