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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1feab731d84be37dbc8b37c6ebb7a37d1cb7bc71a3aaf001f0bab1b09165e4be' 
  AND token = 'Su6q7DicjIlqvXus3ZQPlFVtucUojBzsKPsXbMf82OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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