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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '39670afedafea816c9b9b4039b0530513fa4b2a91374c838fe8ce9e9f7eca3f5' 
  AND token = '7wTTQAkKEkbWcRS2iGk0d/T3EIJfWAOVHlktZ+rucU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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