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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f8e466ad8efa491e1b035d715d0f9a8bb9bb6e38fa1d09112f5ce2c06b607eaf' 
  AND token = '77EC0agxSF3qY171guWojPnZHPawACL2db/jOOrnCY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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