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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '720ee52a2ef038148c8342d6fd97a9c625ee4073192907a14b809579416e284d' 
  AND token = 'P0UVMCpJfQulKiEby4umcYdg3Y7n3HYQFOje06PL1+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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