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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0c156ef3dd75cc6de186ce6f693813b469094ce0fe6b6ca51db80638168a4263' 
  AND token = 'DQ+FuwYguZI5kV+A80lZdfDCalelTJKJfn0IHTLHiKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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