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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '261966a22fdc82b65e1d466431b73e9825cc79f4ee7940473a871372cf26e46d' 
  AND token = 'pfh+gvEUBMbbDR1vLlNZuXFANPzs4jbEfU3aRJD1X6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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