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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '882b19467727d425475d7e25831e3c7c6fd72c6218ac5c276a50a7137e17bb94' 
  AND token = 'i0fGoKXjBn+fP2YEJMv3g3Nsx6nCu2D9Ma++zuR3cHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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