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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bb0cdaf2762df38cadd8ded930488ca6c8873026aea1aaf916836b94ee2386b7' 
  AND token = '/7NcI9A71M+YAr2deI8AXl2SEBuXFgs4SRBmG6om6Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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