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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f6f60c061cb8ff3e16c3c70e4df10a6925769faecde6d19c0aad9bc1394b9220' 
  AND token = '7GVrMY2dWHI69lD/cLgUWtJT+zovdIFktkrGxfn1U84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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