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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '187d905f230d74b4a84698d2d651dd8b8b5ebe0099703d24a3f95f3a5a6fa2e1' 
  AND token = 'FSHcHrzi4GEtSaGraDRPDi3F44+U3pVZCRKpGArnNrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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