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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'be1a9268ad694753ebc570f0b47be881ef7d43d3298dc42ab2c58b250f5554f8' 
  AND token = 'ZBIyS/6TF76g0nBbekTcxT8FY2MvfosH9/B0B/uzA1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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