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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '946982b24449626bc7f1a676717a9692ef38db599295801c45d2d1cc52ff9086' 
  AND token = 'W6/SFlxgLd4raS0qC6GqtrfYUfnooiN23axuXvjgwi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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