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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd6d5efde9e45cef2d5c1d9ca37df412b85a1d1d0c158e7710e3f609457de8029' 
  AND token = 'HFWnhapm6FU8WB6u8RRFmob/QGswcGlSxKmGABEFcoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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