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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '33538b439c5d4fd673cf6a320797f6d9bca61330e3d1de421491004a033b778b' 
  AND token = '7N8XxRFrVwTrLN+hZOid2CcC0IjMpCrBxh0O6Kex7lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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