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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '56a80756a78629b522615df1268bfdac27a779a996e148c568f1161d97256692' 
  AND token = 'dcLQSyhf8x25ogGZ1sFz9ZHeysiCi8gAabac82pyXFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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