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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eb888622706857aeeca2bb3d35cb02b33de6808b6fadff0b3c45926163f9df96' 
  AND token = 'EUD8MtAFxPqu06a4nQBOBTp8Gk2OHunnWnaECHssdMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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