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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1a2e261f909212ac7b264dcef9a33fe7780633a8f2e6d281f36003155b3d90b0' 
  AND token = 'OMrCKSDykMXVnkwtwy8l1NNU+O2GROeiXvKCb38yHLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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