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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2b34821f6ba6165c0d1d4184ef5c0ecfad4a7f1b61da6ab5d643879213c57367' 
  AND token = 'C9IicKLp/euddWpR4xMpLUIwEC5l7SB2I8ZUJCmP0Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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