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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ff79625e730dde91aed944771fb766e9088b462a7e346da190276c43e206a5a3' 
  AND token = 'bhwXvjKQqx5aYwIVvX2YVE30joUMleeqsl335abqyaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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