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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '01956683b94f8e81e98a2e296b2c86f02d189c9fa79d71bb884acf807b93b614' 
  AND token = '4UnobRO3KpVi9r3Q0BPy+0GhkwlM3UJo838+3mpLj8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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