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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '444514f411ea3a814803d585bc9f4aa36514dcfc4f00e3dd337f630e10a813c9' 
  AND token = 'shN0fmCs5W7gvMuI24FhMibi/ethIWL82ZhB32uT1bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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