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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4268d617dd6ff74ca44b4d057e4c877f19e6c91972364f80988e01bec784e81d' 
  AND token = 'kM8PbFnuh0ebiX49RGbreOJhJ8aox9oIMLMD59XnPXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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