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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2d3cf928d1786a6d8b34c2f68dc7e60918996aba3854e240ee0181227418ee17' 
  AND token = 'BJst1ksMmpfNFNhDDt5e2RQQdLc/KJ9qtjH7Ni/KzG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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