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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3ceb71bf70438b855c032b8e085844a50b2826c490ea0a7f8ad878f9311f4beb' 
  AND token = 'jnw4T4BXGWwHpm8EDCwTa737uaSfAS3dh2osAGb2rx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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