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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b38957b8ef6c2cf80c22372b9dd0bba1ee9d73f57a447aa62e32bd3a236858d4' 
  AND token = 'QC08Xhkrrdu0sW4CWvC/FDZNuOjwxCk6g5/e/W+LE9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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