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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '77dd2a2c266268a582d0e98024fddf3531dae5ed6a373f9a5846e45154a6ab28' 
  AND token = 'WI6ULk490cxRs3C6J61CIeHWtn5xQZc/cPv8wR+dEXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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