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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '31b396d1f15355ab3ecae417a5525f0a7a8592e8d5679f9da05b982fdb7d7db2' 
  AND token = '1xKSemaF0Vrhc7FvwuTYwzapERlAPr3zDIBK0Srtzvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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