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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '55eda47c32e9eab6c0b2a37c6eb2e7ae56ccd278ac4b31212fb711c10a7a4b11' 
  AND token = 'LfwW/VLdE3ZaQqk5TPZC92DJgYAE4BEsosdjJgmk0tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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