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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd5fca38a349ccf32dd64ec7999d3232a07b7b73d023b15441311aacb53512aaf' 
  AND token = 'ik3txJCZ0gS3oNjShTzPbCUxppMK3d88qsa0ypcvcL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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