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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '292885df696168e2ec4c5b2a954ca2f240f3bd1fb7115391670b79f7eb92fc5a' 
  AND token = 'Hnxl+g8yRKteSXX4nykqNoCXXbYYMi2TiioT0PQChZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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