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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '782196e6bacda004aa9388caf9e3b15b8d51745d4db97f68752a5764fe6dfcb0' 
  AND token = '/zA/EAerrfygOe7E1/QICHCS7n4b/oOqqnssdbbG4OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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