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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a42a412de7f32bac8de91ec6781a77b5109da4a803c356329ece987bbd125cdf' 
  AND token = 'LZZLF5kX02xorG32fDWnRgAbdgKlICy3FWDAbZby964=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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